Merge remote-tracking branch 'tip/auto-latest'

[karo-tx-linux.git] / arch / x86 / kernel / entry_32.S

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index a2a4f4697889657675289e15e358b7f354ea2225..3a39899b6e4e511dae751c47d95b5e2105fa38f4 100644 (file)
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -314,10 +314,6 @@ ENTRY(ret_from_kernel_thread)
        CFI_ENDPROC
 ENDPROC(ret_from_kernel_thread)
 
-/*
- * Interrupt exit functions should be protected against kprobes
- */
-       .pushsection .kprobes.text, "ax"
 /*
  * Return to user mode is not as complex as all this looks,
  * but we want the default path for a system call return to
@@ -372,10 +368,6 @@ need_resched:
 END(resume_kernel)
 #endif
        CFI_ENDPROC
-/*
- * End of kprobes section
- */
-       .popsection
 
 /* SYSENTER_RETURN points to after the "sysenter" instruction in
    the vsyscall page.  See vsyscall-sysentry.S, which defines the symbol.  */
@@ -456,12 +448,11 @@ sysenter_audit:
        jnz syscall_trace_entry
        addl $4,%esp
        CFI_ADJUST_CFA_OFFSET -4
-       /* %esi already in 8(%esp)         6th arg: 4th syscall arg */
-       /* %edx already in 4(%esp)         5th arg: 3rd syscall arg */
-       /* %ecx already in 0(%esp)         4th arg: 2nd syscall arg */
-       movl %ebx,%ecx                  /* 3rd arg: 1st syscall arg */
-       movl %eax,%edx                  /* 2nd arg: syscall number */
-       movl $AUDIT_ARCH_I386,%eax      /* 1st arg: audit arch */
+       movl %esi,4(%esp)               /* 5th arg: 4th syscall arg */
+       movl %edx,(%esp)                /* 4th arg: 3rd syscall arg */
+       /* %ecx already in %ecx            3rd arg: 2nd syscall arg */
+       movl %ebx,%edx                  /* 2nd arg: 1st syscall arg */
+       /* %eax already in %eax            1st arg: syscall number */
        call __audit_syscall_entry
        pushl_cfi %ebx
        movl PT_EAX(%esp),%eax          /* reload syscall number */
@@ -495,10 +486,6 @@ sysexit_audit:
        PTGS_TO_GS_EX
 ENDPROC(ia32_sysenter_target)
 
-/*
- * syscall stub including irq exit should be protected against kprobes
- */
-       .pushsection .kprobes.text, "ax"
        # system call handler stub
 ENTRY(system_call)
        RING0_INT_FRAME                 # can't unwind into user space anyway
@@ -527,6 +514,7 @@ syscall_exit:
 restore_all:
        TRACE_IRQS_IRET
 restore_all_notrace:
+#ifdef CONFIG_X86_ESPFIX32
        movl PT_EFLAGS(%esp), %eax      # mix EFLAGS, SS and CS
        # Warning: PT_OLDSS(%esp) contains the wrong/random values if we
        # are returning to the kernel.
@@ -537,6 +525,7 @@ restore_all_notrace:
        cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax
        CFI_REMEMBER_STATE
        je ldt_ss                       # returning to user-space with LDT SS
+#endif
 restore_nocheck:
        RESTORE_REGS 4                  # skip orig_eax/error_code
 irq_return:
@@ -549,13 +538,9 @@ ENTRY(iret_exc)
 .previous
        _ASM_EXTABLE(irq_return,iret_exc)
 
+#ifdef CONFIG_X86_ESPFIX32
        CFI_RESTORE_STATE
 ldt_ss:
-       larl PT_OLDSS(%esp), %eax
-       jnz restore_nocheck
-       testl $0x00400000, %eax         # returning to 32bit stack?
-       jnz restore_nocheck             # allright, normal return
-
 #ifdef CONFIG_PARAVIRT
        /*
         * The kernel can't run on a non-flat stack if paravirt mode
@@ -597,6 +582,7 @@ ldt_ss:
        lss (%esp), %esp                /* switch to espfix segment */
        CFI_ADJUST_CFA_OFFSET -8
        jmp restore_nocheck
+#endif
        CFI_ENDPROC
 ENDPROC(system_call)
 
@@ -691,10 +677,6 @@ syscall_badsys:
        jmp resume_userspace
 END(syscall_badsys)
        CFI_ENDPROC
-/*
- * End of kprobes section
- */
-       .popsection
 
 .macro FIXUP_ESPFIX_STACK
 /*
@@ -704,6 +686,7 @@ END(syscall_badsys)
  * the high word of the segment base from the GDT and swiches to the
  * normal stack and adjusts ESP with the matching offset.
  */
+#ifdef CONFIG_X86_ESPFIX32
        /* fixup the stack */
        mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */
        mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */
@@ -713,8 +696,10 @@ END(syscall_badsys)
        pushl_cfi %eax
        lss (%esp), %esp                /* switch to the normal stack segment */
        CFI_ADJUST_CFA_OFFSET -8
+#endif
 .endm
 .macro UNWIND_ESPFIX_STACK
+#ifdef CONFIG_X86_ESPFIX32
        movl %ss, %eax
        /* see if on espfix stack */
        cmpw $__ESPFIX_SS, %ax
@@ -725,6 +710,7 @@ END(syscall_badsys)
        /* switch to normal stack */
        FIXUP_ESPFIX_STACK
 27:
+#endif
 .endm
 
 /*
@@ -781,10 +767,6 @@ common_interrupt:
 ENDPROC(common_interrupt)
        CFI_ENDPROC
 
-/*
- *  Irq entries should be protected against kprobes
- */
-       .pushsection .kprobes.text, "ax"
 #define BUILD_INTERRUPT3(name, nr, fn) \
 ENTRY(name)                            \
        RING0_INT_FRAME;                \
@@ -961,10 +943,6 @@ ENTRY(spurious_interrupt_bug)
        jmp error_code
        CFI_ENDPROC
 END(spurious_interrupt_bug)
-/*
- * End of kprobes section
- */
-       .popsection
 
 #ifdef CONFIG_XEN
 /* Xen doesn't set %esp to be precisely what the normal sysenter
@@ -1239,11 +1217,6 @@ return_to_handler:
        jmp *%ecx
 #endif
 
-/*
- * Some functions should be protected against kprobes
- */
-       .pushsection .kprobes.text, "ax"
-
 #ifdef CONFIG_TRACING
 ENTRY(trace_page_fault)
        RING0_EC_FRAME
@@ -1355,11 +1328,13 @@ END(debug)
 ENTRY(nmi)
        RING0_INT_FRAME
        ASM_CLAC
+#ifdef CONFIG_X86_ESPFIX32
        pushl_cfi %eax
        movl %ss, %eax
        cmpw $__ESPFIX_SS, %ax
        popl_cfi %eax
        je nmi_espfix_stack
+#endif
        cmpl $ia32_sysenter_target,(%esp)
        je nmi_stack_fixup
        pushl_cfi %eax
@@ -1399,6 +1374,7 @@ nmi_debug_stack_check:
        FIX_STACK 24, nmi_stack_correct, 1
        jmp nmi_stack_correct
 
+#ifdef CONFIG_X86_ESPFIX32
 nmi_espfix_stack:
        /* We have a RING0_INT_FRAME here.
         *
@@ -1420,6 +1396,7 @@ nmi_espfix_stack:
        lss 12+4(%esp), %esp            # back to espfix stack
        CFI_ADJUST_CFA_OFFSET -24
        jmp irq_return
+#endif
        CFI_ENDPROC
 END(nmi)
 
@@ -1453,7 +1430,3 @@ ENTRY(async_page_fault)
 END(async_page_fault)
 #endif
 
-/*
- * End of kprobes section
- */
-       .popsection